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Consolidated Statements of Changes in Equity (Deficit) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]      
Changes in net unrealized gains on available-for-sale securities, net of tax $ 28 $ 30 $ 151
Reclassification adjustment for gains included in net income, net of tax $ 139 $ 316 $ 253